/*
 * Copyright (C) 2009 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.example.jnidemo;

import android.app.Activity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.os.Bundle;


public class JniDemo extends Activity
{
	TextView  mTextView;
	Button    mButton1;
	Button    mButton2;
	Button    mButton3;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        /* Create a TextView and set its content.
         * the text is retrieved by calling a native
         * function.
         */
        setContentView(R.layout.main);
        mTextView =(TextView)findViewById(R.id.textview);
        mButton1  = (Button)findViewById(R.id.btn1);
        mButton2  = (Button)findViewById(R.id.btn2);
        mButton3  = (Button)findViewById(R.id.btn3);
        
        mButton1.setOnClickListener(clkListener);
        mButton2.setOnClickListener(clkListener);
        mButton3.setOnClickListener(clkListener);
    }
    
    private Button.OnClickListener clkListener = new Button.OnClickListener(){

		@Override
		public void onClick(View v) {
			// TODO Auto-generated method stub
			if(v.getId() == R.id.btn1 )
				mTextView.setText(stringFromJNI());
			else if(v.getId() == R.id.btn2)
				 mTextView.setText(stringFromJNI("test"));
			else if(v.getId() == R.id.btn3)
				callJavaFromJNI();
		}
    	
    };
    
    public native String stringFromJNI();

    public native String  stringFromJNI(String str);
    
    public native void callJavaFromJNI();
    
    public void viewSetText(int data){
    	if(mTextView != null)
    		mTextView.setText("Set text from java, but called from jni!");
    	else
    		Log.d("test", "error!");
    }
    /* This is another native method declaration that is *not*
     * implemented by 'hello-jni'. This is simply to show that
     * you can declare as many native methods in your Java code
     * as you want, their implementation is searched in the
     * currently loaded native libraries only the first time
     * you call them.
     *
     * Trying to call this function will result in a
     * java.lang.UnsatisfiedLinkError exception !
     */
    public native String  unimplementedStringFromJNI();

    /* this is used to load the 'hello-jni' library on application
     * startup. The library has already been unpacked into
     * /data/data/com.example.HelloJni/lib/libhello-jni.so at
     * installation time by the package manager.
     */
    static {
        System.loadLibrary("jni-demo");
    }
}
